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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '42699ff51c829d26f75c2bf5560f5bd4e3541daa7d8b349bd17b327daa2f850b' 
  AND token = 'z3FypFBFUf/8UTff1utfA7HrbF3DGgDHRyww3epUZ2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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