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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '64ffacbdc0c628e1fac492b3177a4a39e839ef5834e726e0d62d80d9cc0c9ad6' 
  AND token = 'LHggHSA5EBD6xIcrer/z4+ZMD35fu1tjg3UfdvqVN/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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