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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0fb28981abb64beb95942d7ed66dedbe7a8b66bcd4b06db18c14c159a33dd7b8' 
  AND token = 'wRNzIAXC1fEEJ95dTX3e7Uj+dE0MAa49P7Wz0VR5yiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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