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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bd2fd75acdcac313e47966c7dbfaa0bb4a56beff22e9613ea42fd44f8cd350b8' 
  AND token = 'zATEPssaAdyFB8knflE6Pa6nYytIpOIhkJtap6+q1pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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