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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '273b759c922c0a84cc20d9a9019d0e62c1d9dd2d47e81dd081df699d4f3dd4dd' 
  AND token = 'yDPhffAMz9c+RBbIUyWNtUV4QSvpm4y6NWqkGpaAejM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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