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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '38dd913394fd1b6fe25e6e3c09e801a36df192715bd5773f3b298c60e4d8baaa' 
  AND token = 'M2v+QwfbWL0s1wS2ELlk9kQ7HMIqPvBq1NP5ndqp/QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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