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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5c023ef19f9a3b4914c8f0b1ed3fda6f859c58b80b38558ba3559bcb56852c5a' 
  AND token = 'BGVT6VBOEiEf1T1JBiDWSDyLp6/OBK+p+XMTzDBMM8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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