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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aa2d422f9c0b75aae1922beb7ee26dfd2d5e7cb8eb29239ab154944707b56c02' 
  AND token = 'KXC65B+AjUf+g/TQHxYfccOQoG6akPa7O5yJb/cdPlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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