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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9111c606a62f6e47d523763a9d858a95f8d00aa98fb078a4e910bd0becaeaaf6' 
  AND token = 'qf6+razsKxl0A7Q/93YCJ4dir3+AGey2SrzmK/EWvrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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