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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bb76b0dfaa5fee5ca88ff758b9084e945e6d37afd5a25b427b7d8af26cc7fd71' 
  AND token = 'p8GiM2oTK7piYzbZqFJnWgDcYvrNHBRrhhXf9nrHOo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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