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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8d8eb7570b94a68196cdca6fb950eb306be15704e2c0d973be29c00963562bf3' 
  AND token = 'tjtjEuOfsh79c3GuMqlM7XHLDxQP37xblLsq57lCa7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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