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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '213a7b282c5c66c1df2f53090ab69b0fe7c2c698962ac3f7de5e0f8a7342f823' 
  AND token = 'NZqPZctOlfkWrs5CA86OVJ2/KO2eTZwZl5wPXADWWao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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