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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f6ab2eee32ed5ba46f3e896fd10404a5d50ce19c95f5f6fe3acd2f36c07ab97e' 
  AND token = 'eGBOehYfxTLWU4kR67aA4d4m1fdtbc5Wx6XqdsrrkUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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