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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7df76dce33eeb995c6d1bb57a1d60c038d3d195401e483aa33313c615c26f463' 
  AND token = 'bw8Kdsx3for7PeTcDfTyRQSYVmKzXpN7JoQBTagRmOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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