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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcd2cefb1769efb158135f32428bba4a3f3aa6a2d08c61e63eaa27bb3fcfba0c' 
  AND token = 'DSYq9lXHLcFcSpuQMeuA6mP3Aiw2onnzXz9sUEAEqfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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