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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e4c9dc9d2274adf786d3ca9309cf6f7380af94241dce1679622762b9fce136a6' 
  AND token = 'YXHtCHFyxY0y8c5BLSpqbX4sxUA4GOixh6l2uRhUFfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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