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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'befe705cf8eddd882fb0a52261f5d087c71d31ea6d0d2f368128204367359293' 
  AND token = 'Zl66cUcZVY3JuVeEco4yWYflXyN0Ig7zjkIDjKQVYR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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