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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '986019f4af14152cb531a439793478f34881c382a7c82d65d9e34734cd46e01b' 
  AND token = 'FLSS56YPM7cXZhScZkICIsGPNGEHMDD03pLGgA9Cw08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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