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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e43767fc8321722733a0db55db7e5b43b60232c5eb2be1d49dab20ea55c707be' 
  AND token = '/FRWRwQ2fO5E5Xn7dYVoYFM6GszNlZqWLE2L02WyhD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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