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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7db0391ee4a4387831f39d3cf83d3320886658544b1e7c3ba0e389d664d8ee0' 
  AND token = 'r4lWn2Mue1KpNE6xcfhaySKJiByhfJVP7SxXtiqcNTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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