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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd88f4ec3a1cec61629f3f60aa3975b69d8453df735e41789ae50d5456fda66de' 
  AND token = 'f4CJQgirr2niwhrnpVZp4WOu1g40xKdCRwcSjbBX4CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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