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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df7ae8dcec130716ee5d8a1f5e01d18136c1df8d0d194ae05b813da2b90261ea' 
  AND token = '70a8E5pvYYwBBMc2ndbS5HVFd7unjNItmV6fmM/YeXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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