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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '43432cf5e6c2ba74125cf31408d1c6ebb0983f262de4c1bd0211cf6ec2c32719' 
  AND token = '3j0WO1z/HnDduFNVR5SG9pUrIVBhbGGyC5Q4n5ttwis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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