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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc947d491320da2c7242963146d052ff81da710828e244726cf90f9f9158f282' 
  AND token = '6dOQ1yT9lOWng3ciFxcOpYjb+LVs211/A/toMZShHZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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