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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '776b14b325d1a065fad3f19a3a33ebcac6de2d1871e308a6b268a079d904549d' 
  AND token = 'P9fuMM/kithohjfb2iQontLm6WzN5mUp2TOchCxZlO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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