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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '95c35d3fbf9d566b03509c42cd8cae197c5f3fe74e084e6f8b706c70ac675009' 
  AND token = 'uL9Ejne1IvwYC/ldTTg7MFHSZI7/8l8YnodTqtGtXEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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