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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ef149b6f875e8880b15db9fb97836d9cb86a9204e253d8e45a69ab7bb2a6757' 
  AND token = 'NHrthRdNDsUkaBzpcLSH7UbrX9fd8WqTM2cCHzx3nTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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