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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a2692cdda59bac5d58bd14f58cb5aaa605195f936d7a4c7e8668c505998ca43b' 
  AND token = 'DKEc/CqcuKw9suC1pJgEO5REaBi+yrOu90tzVoEMe/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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