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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7804c5d674b049ad72d48ad6813e75860e258dd224866db19efcfa424b90247f' 
  AND token = 'TI4BAKzFmEHWx/n0Ux7C2JF2AIZ8EitDXSKOBbeSP8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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