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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '456400137ecba6b966320495274ea07dd19a7d595de8bbc0ad05fc60781efb0b' 
  AND token = 'Tx2FnjvFvHd0sGA9Drsy6N2kjXnRj0BxiPU1CxANwIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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