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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5bb304157ff1c06e96e24552f40b62458accdf671375ed19f0f82525aa76a541' 
  AND token = 'K6Hi0DhA8yW4QmCTVU07N7tNRXxzTSqBCXQ68WPWvkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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