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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c242162758f22742bfba79dec52f868d4957bc989e505e71dbe9bc4fb87103b3' 
  AND token = '2DeXcpmptsHDae/eOl/NAbQSo/2puN6I06LpUczbjtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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