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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7b249458f8a5e819f91724b4ec9ad670224a09a0abd7a7707dcb86e2a580fd33' 
  AND token = '5pjBCn4W5rx7dbzyiqNyZbNBrL3JeMf+sVJ7OkmKoho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}