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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b5c9556e35727873c0714a1b41716fbacb4ce2cbfff894e421c3ecde9a5388a0' 
  AND token = 'eEvoVsfIEbdw7tKxEJLsA3dWtEmb24pTANpXcbUGZxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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