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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f02fc1d10097941aa3f93468e647a7fdd9951c4513518f0b6ca9c37a2b6a0e23' 
  AND token = '+wjBUSrfjOXosh9zUS+Oela/rnfz06pFHMz2TMdj4Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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