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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '020760f9c1525129ffcfc6c5c88ac20a960c8d47d867648660f3816e3440c2fd' 
  AND token = 'Ud23QnuGXiSzWvEuemHybuHlv9pE1LaS5OGLVvK8T/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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