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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b28b4db129bd6c9973de4ff981939a460d88876df78b2b18642289fc2439d215' 
  AND token = 'Fi4r3Mikz0VH3bZNBQbfxJp97GsKAIylc+iAGdmoQSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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