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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2cccbe8fa54ed7df5d1b0c176b964fadf991567c3a0a99869710c09e7c644a1a' 
  AND token = 'ULU4wJ9s406yarHY792TDK91QvYOpMAbTijUb6Y5Eq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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